access to underlying series map

xchart/src/main/java/com/xeiam/xchart/Chart.java

@@ -19,6 +19,7 @@ import java.awt.Graphics2D;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Date;
+import java.util.Map;
 
 import com.xeiam.xchart.internal.chartpart.ChartPainter;
 import com.xeiam.xchart.internal.style.Theme;
@@ -256,4 +257,9 @@ public class Chart {
     return chartPainter.getHeight();
   }
 
+  public Map<Integer, Series> getSeriesMap() {
+
+    return chartPainter.getAxisPair().getSeriesMap();
+  }
+
 }